Do not expose cell text a second time via AXTitle

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Do not expose cell text a second time via AXTitle
When navigating around a table with VoiceOver via Ctrl+Alt+arrow, each cell is
read twice. In Safari this does not occur because the cell does not have an
AXTitle that duplicates the text content of the cell.
Bug: 780276
Change-Id: If9f7b3af5542125a080227c48fb7b19c002fa3fe
Reviewed-on: https://chromium-review.googlesource.com/747868
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#514420}